Skip to main content
eBay Logo

Shop by category

Advanced
    • Daily Deals
    • Brand Outlet
    • Help & Contact
    • Sell
    • WatchlistExpand Watch List
      Loading...
      Sign in to see your user information
    • My eBayExpand My eBay
      • Summary
      • Recently Viewed
      • Bids/Offers
      • Watchlist
      • Purchase History
      • Buy Again
      • Selling
      • Saved Searches
      • Saved Sellers
      • Messages
    • Expand Cart
      Loading...
      Something went wrong. View cart for details.
    {"modules":["unloadOptimization","bandwidthDetection"],"unloadOptimization":{"browsers":{"Firefox":true,"Chrome":true}},"bandwidthDetection":{"url":"https://ir.ebaystatic.com/cr/v/c1/thirtysevens.jpg","maxViews":4,"imgSize":37,"expiry":300000,"timeout":250}}
    {"delay":300}

    There seems to be a problem serving the request at this time

    You are here

    1. eBay
    2. Pet Supplies
    3. Fish & Aquariums
    4. Aquarium Water Tests & Treatment
    Skip to page navigation

    Aquarium Water Tests & Treatment

    Side Refine Panel

    Shop by Category

    • Fish & Aquariums
    • Water Tests & Treatment
    • Air Stones
    • Aquariums & Tanks
    • Cleaning & Maintenance
    • CO2 Equipment
    • Coral & Live Rock
    • Decorations
    • Feeders
    • Filters
    • Filter Media & Accessories
    • Fish Pond Supplies
    • Food
    • Gravel & Substrate
    • Health Care
    • Heaters & Chillers
    • Lighting & Bulbs
    • Live Fish
    • Live Invertebrates
    • Live Plants
    • Meters & Controllers
    • Pumps (Air)
      • Pumps (Water)
      • Reverse Osmosis & Deionization
      • Tubing & Valves
      • UV Sterilizers
      • Other Fish & Aquarium Supplies
    LessView less categories
    • Water Type

      • Fresh
      • Marine
      • All Water Types
      • Pond
    • Test/Treatment Parameter

      • pH Level
      • Nitrate
      • Ammonia
      • Alkalinity/KH
      • Chlorine
      • Bacteria
      • Phosphate
      • Algae
    • Brand

      • API
      • Seachem
      • Red Sea
      • Tétra
      • Aqueon
      • Salifert
      • JBL
      • Unbranded
    • Type

      • Test Kit
      • Water Additive
      • Water Conditioner
      • Plant Fertilizer
      • Aquarium Cycling Starter
    • Tank Capacity

      • Condition

        • New
        • Used
      • Price

        • Under $15.00
        • $15.00 to $35.00
        • Over $35.00
        • Please provide a valid price range
          $
          -$
      • Buying Format

        • All Listings
        • Best Offer
        • Auction
        • Buy It Now
        • Classified Ads
      • Item Location

        • Default
        • Go
        • US Only
        • North America
        • Worldwide
      • Delivery Options

        • Free Shipping
        • Free In-store Pickup
      • Show only

        • Returns Accepted
        • Completed Items
        • Sold Items
        • Deals & Savings
        • Authorized Seller
        • Authenticity Guarantee

      Shop by Water Type

      Showing slide {CURRENT_SLIDE} of {TOTAL_SLIDES} - Shop by Water Type

      • Fresh

        Fresh

      • Marine

        Marine

      • All Water Types

        All Water Types

      • Pond

        Pond

      Shop by Test/Treatment Parameter

      Showing slide {CURRENT_SLIDE} of {TOTAL_SLIDES} - Shop by Test/Treatment Parameter

      • pH Level

      • Ammonia

      • Alkalinity/KH

      • Nitrate

      • Phosphate

      • Bacteria

      • Salt

      • GH

      • Chlorine

      • Algae

      • Nitrite

      • CO2

      Best Selling

      See All - Best Selling

      Showing slide {CURRENT_SLIDE} of {TOTAL_SLIDES} - Best Selling

      • API Freshwater Master Test Kit
        API Freshwater Master Test Kit
        4.9 out of 5 stars
        (257)Total Ratings 257,
        $28.00 New
        $12.00 Used
      • Aquarium Solutions Hikari Prazipro 16oz Parasite Treatment
        Aquarium Solutions Hikari Prazipro 16oz Parasite Treatment
        4.9 out of 5 stars
        (16)Total Ratings 16,
        $35.99 New
      • API Saltwater Marine Master Aquarium Test Kit - 401M
        API Saltwater Marine Master Aquarium Test Kit - 401M
        4.9 out of 5 stars
        (82)Total Ratings 82,
        $26.99 New
        $19.98 Used
      • Fish & Aquatic Supplies Prime 250 Milliliter
        Fish & Aquatic Supplies Prime 250 Milliliter
        5 out of 5 stars
        (24)Total Ratings 24,
        $10.34 New
      • weipro PH2010 PH2010A Ph Meter Value Controller with Probe marine fresh aquarium
        weipro PH2010 PH2010A Ph Meter Value Controller with Probe marine fresh aquarium
        5 out of 5 stars
        (9)Total Ratings 9,
        $79.99 New
      • ATI Lab Test Kit for Icp-oes Complete Water Analysis
        ATI Lab Test Kit for Icp-oes Complete Water Analysis
        $44.95 New
      • Seachem Labs Ammonia Alert Aquarium Water Test Kit
        Seachem Labs Ammonia Alert Aquarium Water Test Kit
        4.4 out of 5 stars
        (25)Total Ratings 25,
        $10.29 New
      • Salifert Po4 Profi Test Kit Phosphate 60 Aquarium Tests
        Salifert Po4 Profi Test Kit Phosphate 60 Aquarium Tests
        5 out of 5 stars
        (8)Total Ratings 8,
        $12.00 New
      • All

      • Auction

      • Buy It Now

      • Best Match
      • Time: ending soonest
      • Time: newly listed
      • Price + Shipping: lowest first
      • Price + Shipping: highest first
      • Distance: nearest first
      List View

      1-48 of 11,283 Results

      • Seachem Prime   Free Shipping

        Seachem Prime Free Shipping

        $6.39 to $56.50
        FAST 'N FREE
        84 sold
      • Seachem Prime

        Seachem Prime

        5 out of 5 stars
        (24)24 product ratings - Seachem Prime
        $7.95 to $50.58
        Free shipping
        356 sold
      • API FRESHWATER MASTER TEST KIT - HIGH RANGE PH, AMMONIA, NITRITE, NITRATE

        API FRESHWATER MASTER TEST KIT - HIGH RANGE PH, AMMONIA, NITRITE, NITRATE

        5 out of 5 stars
        (262)262 product ratings - API FRESHWATER MASTER TEST KIT - HIGH RANGE PH, AMMONIA, NITRITE, NITRATE
        $29.99
        Free shipping
        Only 1 left!
      • SeaChem Prime Water Conditioner (100ML,250ML,500ML,1L)

        SeaChem Prime Water Conditioner (100ML,250ML,500ML,1L)

        $12.99 to $18.99
        Free shipping
        64 sold
      • Seachem Stability

        Seachem Stability

        5 out of 5 stars
        (11)11 product ratings - Seachem Stability
        $7.99 to $51.99
        Free shipping
        74 sold
      • REEF HD - REEF FLUX REMOVES FISH INFECTIONS ALGAE BRYOPSIS CAULERPA GREEN HAIR

        REEF HD - REEF FLUX REMOVES FISH INFECTIONS ALGAE BRYOPSIS CAULERPA GREEN HAIR

        4.5 out of 5 stars
        (13)13 product ratings - REEF HD - REEF FLUX REMOVES FISH INFECTIONS ALGAE BRYOPSIS CAULERPA GREEN HAIR
        $14.95
        Free shipping
        Only 1 left!
      • API Saltwater Master Test Kit PH Ammonia Nitrate Nitrite Aquarium Water Tests

        API Saltwater Master Test Kit PH Ammonia Nitrate Nitrite Aquarium Water Tests

        5 out of 5 stars
        (82)82 product ratings - API Saltwater Master Test Kit PH Ammonia Nitrate Nitrite Aquarium Water Tests
        $26.99
        Was: $31.75
        Free shipping
        115 sold
      • MicroBacter 7 Complete Bioculture for Marine & Freshwater (250 ML - 8 oz) - Brig

        MicroBacter 7 Complete Bioculture for Marine & Freshwater (250 ML - 8 oz) - Brig

        5 out of 5 stars
        (18)18 product ratings - MicroBacter 7 Complete Bioculture for Marine & Freshwater (250 ML - 8 oz) - Brig
        $9.99
        $2.99 shipping
        Only 1 left!
      • Seachem Flourish Root Tabs Aquarium Plant Food 10pk

        Seachem Flourish Root Tabs Aquarium Plant Food 10pk

        $11.25
        Free shipping
        367 sold
      • American Marine Selcon Concentrate - 60 ML

        American Marine Selcon Concentrate - 60 ML

        5 out of 5 stars
        (8)8 product ratings - American Marine Selcon Concentrate - 60 ML
        $13.99
        Free shipping
        252 sold
      • Sea-Lab Marine Aquarium Products #28 Automatic Replenisher  - 1/2LB JAR

        Sea-Lab Marine Aquarium Products #28 Automatic Replenisher - 1/2LB JAR

        $14.99
        Free shipping
      • HI713-25 PHOSPHATE LOW RANGE CHECKER REAGENT (25 TESTS) - HANNA INSTRUMENTS

        HI713-25 PHOSPHATE LOW RANGE CHECKER REAGENT (25 TESTS) - HANNA INSTRUMENTS

        $9.00
        $2.99 shipping
        Only 1 left!
      • Seachem Flourish Excel

        Seachem Flourish Excel

        $10.89 to $37.99
        Free shipping
        218 sold
      • Seachem Stress Guard

        Seachem Stress Guard

        5 out of 5 stars
        (3)3 product ratings - Seachem Stress Guard
        $8.99 to $17.95
        Free shipping
        79 sold
      • TAP Water Conditioner, Freshwater & Saltwater Aquariums Neutralizes Chlorine,8oz

        TAP Water Conditioner, Freshwater & Saltwater Aquariums Neutralizes Chlorine,8oz

        $8.50
        Free shipping
      • API Calcium test kit

        API Calcium test kit

        5 out of 5 stars
        (11)11 product ratings - API Calcium test kit
        $10.25
        Free shipping
      • API Test Tubes / Test Kit Vials - Set of 4

        API Test Tubes / Test Kit Vials - Set of 4

        $6.00
        $3.22 shipping
      • Tap Water Conditioner ~ DECHLORINATOR ~ remove CHLORINE ~ 2oz Treats 5280Gallons

        Tap Water Conditioner ~ DECHLORINATOR ~ remove CHLORINE ~ 2oz Treats 5280Gallons

        $7.48
        Free shipping
        895 sold
      • Joes Juice Aiptasia & Majano Eliminator Reef Safe 20ml

        Joes Juice Aiptasia & Majano Eliminator Reef Safe 20ml

        4.5 out of 5 stars
        (14)14 product ratings - Joes Juice Aiptasia & Majano Eliminator Reef Safe 20ml
        $9.95
        Free shipping
        63 sold
      • FritzZyme Turbo Start 700 (Freshwater)

        FritzZyme Turbo Start 700 (Freshwater)

        $21.99 to $101.99
        FAST 'N FREE
      • ACCU-CLEAR Freshwater Aquarium Water Clarifier,Clears Cloudy Water Aquarium ,8oz

        ACCU-CLEAR Freshwater Aquarium Water Clarifier,Clears Cloudy Water Aquarium ,8oz

        $11.68
        Free shipping
      • Seachem Alert Series Alert Combo Freshwater pH & Ammonia Continuous Readings

        Seachem Alert Series Alert Combo Freshwater pH & Ammonia Continuous Readings

        4.5 out of 5 stars
        (37)37 product ratings - Seachem Alert Series Alert Combo Freshwater pH & Ammonia Continuous Readings
        $12.99
        Was: $16.24
        Free shipping
        110 sold
      • SEACHEM - SAFE DRY WATER CONDITIONER (1 KG)

        SEACHEM - SAFE DRY WATER CONDITIONER (1 KG)

        $32.99
        Free shipping
        Only 1 left!
      • API Saltwater Master Test for pH, Ammonia Nitrite, & Nitrate -Fast Easy Accurate

        API Saltwater Master Test for pH, Ammonia Nitrite, & Nitrate -Fast Easy Accurate

        $12.00
        $8.40 shipping
        Benefits charity
        1 bid · Ending Mar 18 at 8:11AM PDT9d 13h
      • SEACHEM AMMONIA ALERT - AMMONIA MONITOR AQUARIUM SENSOR WATER QUALITY

        SEACHEM AMMONIA ALERT - AMMONIA MONITOR AQUARIUM SENSOR WATER QUALITY

        4.5 out of 5 stars
        (25)25 product ratings - SEACHEM AMMONIA ALERT - AMMONIA MONITOR AQUARIUM SENSOR WATER QUALITY
        $7.35
        $2.99 shipping
        Only 1 left!
      • TAP Water Conditioner For Freshwater & Saltwater Aquariums Neutralizes Chlorine

        TAP Water Conditioner For Freshwater & Saltwater Aquariums Neutralizes Chlorine

        $25.49
        Free shipping
      • Seachem Safe

        Seachem Safe

        5 out of 5 stars
        (32)32 product ratings - Seachem Safe
        $12.83 to $110.79
        Free shipping
        156 sold
      • API  GH & KH Test Kit Freshwater Hardness Test Kit

        API GH & KH Test Kit Freshwater Hardness Test Kit

        5 out of 5 stars
        (43)43 product ratings - API GH & KH Test Kit Freshwater Hardness Test Kit
        $12.58
        Free shipping
      • Ammonia Test Kit (130 Tests) - API

        Ammonia Test Kit (130 Tests) - API

        5 out of 5 stars
        (58)58 product ratings - Ammonia Test Kit (130 Tests) - API
        $10.25
        $2.99 shipping
        Only 1 left!
      • API Replacement Test Tubes w/Cap  (3 ea) by Mars Fishcare

        API Replacement Test Tubes w/Cap (3 ea) by Mars Fishcare

        $7.77
        Was: $9.14
        Free shipping
        Only 1 left!
      • Red Sea Aiptasia-X Anemone Pest Killer 60 ml

        Red Sea Aiptasia-X Anemone Pest Killer 60 ml

        $12.89
        Free shipping
        74 sold
      • DINO X (250 ML) REMOVES HAIR ALGAE & DINOFLAGELLATES - FAUNA MARIN

        DINO X (250 ML) REMOVES HAIR ALGAE & DINOFLAGELLATES - FAUNA MARIN

        $29.99
        Free shipping
        Only 1 left!
      • API E.M. Powder Packets - 10 pk Fish Diseases Medication

        API E.M. Powder Packets - 10 pk Fish Diseases Medication

        $17.99
        $4.99 shipping
        111 sold
      • HI98319 Salinity & Temperature Tester - Hanna

        HI98319 Salinity & Temperature Tester - Hanna

        $30.00
        $10.00 shipping
        2 bids · Ending Friday at 2:38PM PST3d 20h
      • MicroBacter 7 Complete Bioculture for Marine & Freshwater (2L - 67 oz) - Brightw

        MicroBacter 7 Complete Bioculture for Marine & Freshwater (2L - 67 oz) - Brightw

        5 out of 5 stars
        (12)12 product ratings - MicroBacter 7 Complete Bioculture for Marine & Freshwater (2L - 67 oz) - Brightw
        $39.99
        Free shipping
        Only 1 left!
      • Fluval Cycle Biological Enhancer

        Fluval Cycle Biological Enhancer

        $11.75 to $51.95
        Free shipping
        72 sold
      • Seachem Prime Aquarium Fish Tank Toxics Remover Water Conditioner-eBay Cheapest!

        Seachem Prime Aquarium Fish Tank Toxics Remover Water Conditioner-eBay Cheapest!

        $8.99 to $100.00
        $0.87 shipping
        15 sold
      • Seachem MultiTest Iron 75 Tests

        Seachem MultiTest Iron 75 Tests

        4.5 out of 5 stars
        (5)5 product ratings - Seachem MultiTest Iron 75 Tests
        $17.95
        Free shipping
      • NilocG Aquatics | Thrive All In One Liquid Fertilizer | 500ml Bottle |

        NilocG Aquatics | Thrive All In One Liquid Fertilizer | 500ml Bottle |

        4.5 out of 5 stars
        (9)9 product ratings - NilocG Aquatics | Thrive All In One Liquid Fertilizer | 500ml Bottle |
        $25.99
        Free shipping
        277 sold
      • tetra safestart plus Concentrated 8.45 Oz

        tetra safestart plus Concentrated 8.45 Oz

        $11.99
        Free shipping
        or Best Offer
      • Seachem Flourish   Free Shipping

        Seachem Flourish Free Shipping

        5 out of 5 stars
        (11)11 product ratings - Seachem Flourish Free Shipping
        $6.49 to $17.95
        FAST 'N FREE
        24 sold
      • Hanna Instruments HI772 (dKH) Marine Alkalinity Checker HC

        Hanna Instruments HI772 (dKH) Marine Alkalinity Checker HC

        $20.00
        $8.25 shipping
        1 bid · Ending Mar 14 at 1:22PM PDT5d 18h
      • Hikari Aquarium Solutions Prazipro - Free Ship

        Hikari Aquarium Solutions Prazipro - Free Ship

        $9.00 to $38.50
        Free shipping
        26 sold
      • Seachem | Stress Guard

        Seachem | Stress Guard

        $18.99 to $25.99
        Free shipping
        28 sold
      • Aqueon Water Clarifier - 16 Ounce (3 bottles)

        Aqueon Water Clarifier - 16 Ounce (3 bottles)

        5 out of 5 stars
        (6)6 product ratings - Aqueon Water Clarifier - 16 Ounce (3 bottles)
        $9.00
        $7.20 shipping
        or Buy It Now
        0 bids · Ending Mar 15 at 5:30PM PDT6d 22h

      Results Pagination - Page 1

      1. 1
      2. 2
      3. 3
      4. 4
      5. 5
      6. 6
      7. 7
      8. 8
      9. 9
      10. 10

      Top Rated

      See All - Top Rated

      Showing slide {CURRENT_SLIDE} of {TOTAL_SLIDES} - Top Rated

      • API Freshwater Master Test Kit
        API Freshwater Master Test Kit
        4.9 out of 5 stars
        (262)Total Ratings 262,
        99% agree - Would recommend
        $28.00 New
        $12.00 Used
      • API Saltwater Marine Master Aquarium Test Kit - 401M
        API Saltwater Marine Master Aquarium Test Kit - 401M
        4.9 out of 5 stars
        (82)Total Ratings 82,
        100% agree - Would recommend
        $26.99 New
        $19.98 Used
      • Seachem MetroPlex Parasite and Bacteria Treatment
        Seachem MetroPlex Parasite and Bacteria Treatment
        4.9 out of 5 stars
        (45)Total Ratings 45,
        97% agree - Would recommend
        $8.95 New
      • Seachem Safe, 250 g / 8.8 oz
        Seachem Safe, 250 g / 8.8 oz
        4.9 out of 5 stars
        (32)Total Ratings 32,
        100% agree - Would recommend
        $12.83 New
      • API Phosphate Test Kit 150 Tests Liquid 63l
        API Phosphate Test Kit 150 Tests Liquid 63l
        4.9 out of 5 stars
        (27)Total Ratings 27,
        100% agree - Would recommend
        $9.99 New
        $1.99 Used
      • Fish & Aquatic Supplies Prime 250 Milliliter
        Fish & Aquatic Supplies Prime 250 Milliliter
        5 out of 5 stars
        (24)Total Ratings 24,
        100% agree - Would recommend
        $10.34 New
      • Seachem Prime 438 Aquarium Water Conditioner - 2 Litre / 67.6 Fl. Oz
        Seachem Prime 438 Aquarium Water Conditioner - 2 Litre / 67.6 Fl. Oz
        5 out of 5 stars
        (23)Total Ratings 23,
        100% agree - Would recommend
        $49.95 New
      • Seachem Stability 500ml 500 Ml
        Seachem Stability 500ml 500 Ml
        5 out of 5 stars
        (23)Total Ratings 23,
        100% agree - Good value
        $18.23 New
      You May Also Like
      Slide {current_page} of {total_pages} - You May Also Like
      • Other Fish & Aquarium Supplies

      • Tropical Fish Food

      • Seachem Aquarium Water Tests and Treatment

      • Fish Health Care Medication

      • Aquarium Water Test Kit

      • Aquarium Water Conditioner

      • API Aquarium Water Test Kits

      More To Explore

      Seachem Prime
      water conditioner

      Additional site navigation

      • About eBay
      • Announcements
      • Community
      • Security Center
      • Resolution Center
      • Seller Center
      • Policies
      • Affiliates
      • Help & Contact
      • Site Map
      Copyright © 1995-2021 eBay Inc. All Rights Reserved. Accessibility, User Agreement, Privacy, Cookies, Do not sell my personal information and AdChoiceNorton Secured - powered by Verisign